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Longworth Lathe Chuck

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Project by Ger21 posted 12-21-2009 07:10 PM 11832 views 40 times favorited 32 comments Add to Favorites Watch

Stumbled across some pics of these about 2 weeks ago, and thought it would be cool to make one. CNC makes routing the slots pretty painless. I routed a pocket for a 1”-8 hex nut, and epoxied it in place. Back and hub body are 3/4” baltic birch, and the front plate is 1/4” MDF. Only problem is that when epoxying the nut in, its a bit tricky (nearly impossible) to get the nut perfectly perpendicular to the face. I fixed that by building a jig and surfacing the face with a router while it was spinning on the lathe. I’ve figured out how to correct this for the next one.

Anyway, it actually works pretty good. Here’s a video of it spinning a rough bowl.
http://www.youtube.com/watch?v=m-aNG2cl6Ds

-- Gerry, http://home.comcast.net/~cncwoodworker/CNC_Woodworker.html





32 comments so far

View lew's profile

lew

10029 posts in 2408 days


#1 posted 12-21-2009 07:27 PM

Wow, Gerry- THANK YOU!!!!!

I have been looking for something like this for a long time. The chuck I made has straight slots and is constantly releasing the work as it spins. This will solve that problem. Off to the shop!!

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View stefang's profile

stefang

13019 posts in 1987 days


#2 posted 12-21-2009 07:40 PM

Hey Gerry. I like this chuck. It looks really flexible because it adjusts to any size. The only thing I wonder about (and this is not a sly way to criticize) is about getting the workpiece properly centered. I suppose you could just deduct the diameter of your bowl from the diameter of the chuck, but I’m thinking about getting all those handles tightened in an accurate position. How do you do it?

-- Mike, an American living in Norway.

View Ger21's profile

Ger21

643 posts in 1783 days


#3 posted 12-21-2009 07:44 PM

It’s self centering. the slots on the front and back go in different direction, so as you turn the discs, the stops move in and out. Google Longworth Chuck and you’ll find more info.

-- Gerry, http://home.comcast.net/~cncwoodworker/CNC_Woodworker.html

View DaleM's profile

DaleM

913 posts in 2036 days


#4 posted 12-21-2009 08:10 PM

Wow, I didn’t even notice the slots went the other way until your reply to Mike. Now I see why you made a front piece and back piece. I thought it was just layers. That’s really cool.

-- Dale Manning, Carthage, NY

View stefang's profile

stefang

13019 posts in 1987 days


#5 posted 12-21-2009 08:46 PM

Thanks much Gerry. Self centering is good.

-- Mike, an American living in Norway.

View stefang's profile

stefang

13019 posts in 1987 days


#6 posted 12-21-2009 09:11 PM

Hey Gerry I searched the net for Longworth lathe chuck plans and it’s been chemically rinsed of any actual plans that I could find. I did find a list of materials needed and some construction instructions but only one outline drawing of the outside of the faceplate. Have you a specific source for plans? Thanks for any help.

-- Mike, an American living in Norway.

View lew's profile

lew

10029 posts in 2408 days


#7 posted 12-21-2009 09:23 PM

Found this site that has some construction information.

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View Ger21's profile

Ger21

643 posts in 1783 days


#8 posted 12-21-2009 09:37 PM

That’s where I got some of my info from, including the idea to use the nut, rather than a faceplate. Much cheaper. I wish he’d shown how he mounted the nut, though. I didn’t want mine to blow apart, so I used a 2-5/8” diameter hub. This limits me to holding a 3” part inside the jaws, and about 5” on the outside. His looks like it goes a lot smaller.

-- Gerry, http://home.comcast.net/~cncwoodworker/CNC_Woodworker.html

View Bob #2's profile

Bob #2

3808 posts in 2674 days


#9 posted 12-21-2009 09:39 PM

The lathe is turning the wrong way.
It should turn toward you unless you are really small and can shimmy in againt the wall. <g>
It looks to me like you have your “bowl chucker” mounted on the wrong side of the slots

Oh, and the bowl is not centered so if you do decide to tool it you are going to end up perforating it or having an out of round edge at least.

Regards

Bob

-- A mind, like a home, is furnished by its owner

View rustedknuckles's profile

rustedknuckles

160 posts in 2404 days


#10 posted 12-21-2009 09:47 PM

I built one of those a few years ago, it works great.

-- Dave- New Brunswick

View toyguy's profile

toyguy

1358 posts in 2490 days


#11 posted 12-21-2009 09:49 PM

I have looked at these a dozen time on the net…. But for the first time i see that the slots run in different directions to make this self centering…...... I guess I need to look at things like this a bit closer…. Duh !!!!

-- Brian, Ontario Canada,

View Ger21's profile

Ger21

643 posts in 1783 days


#12 posted 12-21-2009 10:23 PM

Bob, the headstock on my lathe is turned around away from the bed. I inadvertently made the chuck too big, so had to turn the headstock around to mount it.

-- Gerry, http://home.comcast.net/~cncwoodworker/CNC_Woodworker.html

View Ger21's profile

Ger21

643 posts in 1783 days


#13 posted 12-21-2009 10:25 PM

And the “bowl” is solid, and is actually not really round. I rough turned it when it was wet, and it’s been lying in the garage for several months. I wasn’t actually able to finish turning it, as the spalting is too soft.

-- Gerry, http://home.comcast.net/~cncwoodworker/CNC_Woodworker.html

View stefang's profile

stefang

13019 posts in 1987 days


#14 posted 12-21-2009 10:56 PM

Thanks a load Lew and Gerry. I went to the article. I am definitely going to make one soon as possible. I have the materials I need already. I just need to get the hardware.

-- Mike, an American living in Norway.

View Bob #2's profile

Bob #2

3808 posts in 2674 days


#15 posted 12-21-2009 11:01 PM

Ger21
“I wasn’t actually able to finish turning it, as the spalting is too soft”
I wondered about that too.

The problem here is that with 14,000 “inerested viewers that if you don’t clarify these things on your post it is possible that an unknowiing beginner will copy exaclty what he sees in the pictures.

Regards

Bob

-- A mind, like a home, is furnished by its owner

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